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Bacon et al. (1) “reject a 3.5 Ma assumption” for the closure of the Central American Seaway, a conclusion that echoes earlier studies that established that the “bulk [of marine ‘geminate’ or ‘transisthmian’ species on opposite sides of the Isthmus] were split at some point during the long period of geological upheavals associated with the rising Isthmus,” ∼15–2.8 Ma (2). However, Bacon et al. (1) also argue that large DNA sequence divergences between some transisthmian lineages reveal that the Isthmus geographically isolated marine species as early as 24 Ma. Although Bacon et al. (1) consider the impact of random error on their results, they …

Do large molecular sequence divergences imply an early closure of the Isthmus of Panama?